So, there is no sequel series in sight. But the creator did reveal that the franchise could be seen again in the future. It would just have to take place before The Sopranos did.

“I could conceive of maybe a prequel of The Sopranos,” he said. “I could never see [a return of the show] except as a prequel.”

This idea will have fans ecstatic, but don't get too excited just yet. This comment was nothing more than the series creator answering a question about his former show. As of now, HBO has no plans to revisit The Sopranos.